<!DOCTYPE html>
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<html>
    <head>
        <meta charset="UTF-8">
        <title></title>
    </head>
    <body>
        <?php
        $a=date('10');
        if ($a<'20'){
            echo '天才是由勤奋出来的';
        }
 else {
            echo '欢迎你来到java的世界';
 }
        ?>
    </body>
</html>
